I vote for never surrendering and having to send the rifle back to have something as simple as re-setting/re-timing a disconnector.
1. Since the hammer tail is striking the disconnector tail hard enough to leave a line (hope I read you right), grind .040 of the tail of the hammer (not the sear) to allow the hammer to be lowered father down into the receiver before it contacts the back of the disconnector (tail/behind the hook). The hammer/disconnector may not be a present problem, but is a sign of the hammer/carrier binding on the rearward cocking-stroke (with the trigger held back). Where the problem of binding will rear it ugly head is when you start to shoot light load, which the binding may cause problems with short stroking.
2. With a rag/piece of towel in front the of the hammer and receiver/hammer contact point if the hammer slams forward, hold the trigger back, lock the hammer onto the disconnector, then slowly release the trigger until the hammer is released by the disconnector and caught by the trigger front sear. Note the distance of the trigger/hammer release point, and the amount of distance that the trigger still travels forward before it stops all the way forward. The trigger free run after release should be .020/.040 of forward travel (read two thick black hairs). Now if you have more free run than this, you remove metal from the bottom front portion of the disconnector (where it rides/contact the front of the hammer. By removing metal here, it cams the hook forward on the trigger, and retards the release of the hammer from the disconnector during the forward movement of the trigger.
P.S. Granted that you don't need to set the disconnector release point this tight/short, But since I will tweak the sears during a trigger job, the disconnector retaining the hammer until just before it comes to rest allows the trigger sear to get into the catch position as far as possible upward before the hammer is released. This allows the trigger sear to retain the hammer on re-set, and not be deflected off the trigger sear (read very little sear contact), causing the rifle to double/fire on trigger release.